Steel screw posts are ideal for binding large/heavy books, carpet samples, and other items that are just too heavy for aluminum screw posts. They are also useful for books that are in constant use or are often mistreated. These posts will stand up to rough treatment that would destroy lesser bindings.
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Use a paper drill to drill holes in a large number of sheets of paper, or stacks of cover stock, foam core, and similar materials.
For holes in wood, metal, plastics, etc., use a drill press with a bit suited to the material. Your material supplier can probably give you some suggestions on what works best.
Some people suggest a drop of thread lock or adhesive for more durable applications. Be very certain that you want the connection to be permanent if you do this.
Also, choose the length of the post carefully. It should be long enough to tighten the screw firmly against the post, but not more than the combined thickness of the leather pieces.